A ray of light travelling in air is incident on the plane of a transparent medium. The angle of incidence is 45∘ and that of refraction is 30∘. Find the refractive index of the medium.
∠i=45∘
∠r=30∘
μ=sin isin r=sin 45∘sin 30∘=(1√2)(12)=√2
The refractive index of the medium is √2 or 1.414.